166210644 has 12 divisors (see below), whose sum is σ = 387824864. Its totient is φ = 55403544.

The previous prime is 166210643. The next prime is 166210663. The reversal of 166210644 is 446012661.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166210643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6925432 + ... + 6925455.

Almost surely, 2^166210644 is an apocalyptic number.

It is an amenable number.

166210644 is an abundant number, since it is smaller than the sum of its proper divisors (221614220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166210644 is a wasteful number, since it uses less digits than its factorization.

166210644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13850894 (or 13850892 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 166210644 is about 12892.2707076760. The cubic root of 166210644 is about 549.8188317904.

The spelling of 166210644 in words is "one hundred sixty-six million, two hundred ten thousand, six hundred forty-four".